Il nucleo, avvolto da una doppia membrana dotata di pori per poter comunicare col citoplasma, contiene il DNA sotto forma di cromatina e un nucleolo che assembla i ribosomi.

I batteri sono cellule procariote; queste cellule sono prive di membrana cellulare e possono vivere anche negli ambienti più estremi.

La parte fluida del citoplasma, il citosol, è una soluzione di ioni, piccole molecole e grosse proteine; nelle cellule eucariote metà del citoplasma è costituito da piccole strutture chiamate organuli.

Tutte le cellule sono rivestite da una membrana cellulare, formata da un doppio strato fosfolipidico; le cellule vegetali hanno anche una parete rigida costituita da cellulosa.

Le cellule Eucariote: hanno dimensioni limitate per favorire il rapporto superficie/volume e rendere le cellule metabolicamente attive.

Il citoscheletro mantiene la forma della cellula, fissa gli organuli, dirige il traffico interno e le consente di muoversi; è formato da filamenti di actina, microtubuli e filamenti intermedi.

Ciglia e flagelli sono formati da filamenti proteici; servono per il movimento.

Il vacuolo è una cavità citoplasmatica contenente acqua e soluti, delimitata da una membrana; le vescicole con funzione di trasporto, sono piccole e hanno una struttura uguale al vacuolo

Il reticolo endoplasmatico è costituito da un sistema di membrane; il reticolo rugoso ricoperto di ribosomi da ribosomi sintetizza le proteine e il reticolo liscio sintetizza soppratutto lipidi.

I lisosomi sono vescicole che racchiudono gli enzimi coinvolti nelle reazioni di idrolisi, i proteasomi sono specializzati nel demolire proteine per riciclare amminoacidi, i perossisomi contengono diversi enzimi ossidativi.

I cloroplasti svolgono la fotosintesi clorofialiana ; nei mitocondri, invece, avviene la respirazione cellullare.

I ribosomi sono sono siti presso cui vengono assemblati gli amminoacidi per la sintesi delle proteine.

L'apparato di golgi è un centro di elaborazione di molecole complesse che vengono poi avvolte in vescicole e trattenute nella cellula stessa o esportate.

We need to redefine community and find a variety of ways of coming together and helping each other.

By far the most dangerous foe we have to fight is apathy - indifference from whatever cause, not from a lack of knowledge, but from carelessness, from absorption in other pursuits, from a contempt bred of self satisfaction.

American is the first democratic nation-state.

It is an ill thing to be the first to bring news of ill.

A lot of writing's going down dead ends that don't go anywhere.

There are a lot of movies made for nobody.

I believe that as much as you take, you have to give back. It’s important not to focus on yourself too much.

You gotta keep the ball off the fat part of the bat.

The art world seems so much bigger than it was when I was growing up.

I will do comedy until the day I die: inappropriate comedy, funny comedy, gender-bending, twisting comedy, whatever comedy is out there.

All three networks have always had a morning show but now cable of course is taking some of that audience away and a variety of other things, probably the Internet as well.

I could never fall in love just for money. I like my co-stars, and they are a bunch of good-looking men. But I've dated an actor. My dream man has to be a lot more than just good looking and rich!

Once you get into a routine of eating healthy, it hurts twice as much when you fall off the wagon.

In South Korea, they believe that when you turn 60, you've become a baby again and the rest of your life should be totally about joy and happiness, and people should leave you alone, and I just think that that's the height of intelligence.

When I was little, I was actually really shy. I really enjoyed doing school plays, but I found the whole thing terrifying. I cried myself to sleep once because I thought my teacher was going to give me the lead role. I never imagined acting was a viable career.

With comics, you've got to develop some kind of shorthand. You can't make every drawing look like a detailed etching. The average reader actually doesn't want all that detail; it interferes with the flow of the reading process.

The Cat Dancer is a 30-inch piece of wire with some little cardboard cylinders on the end. My cats go crazy for it. I stuck it on the wall with the adhesive mount, but I ended up taking it off so I could hold it and play directly with my cats.

No matter what you do, if you're trying to create something new, your environment has a massive impact on you.

I think my films are always quite self-reflexive and always question 'why am I doing this, is this the right way to do it, what is cinema for, does it have a purpose?'

When the wells dry we know the worth of water.

It's so important to have that independence. You know it yourself: Everyone needs evenings of their own.

I was one of the actors in 'Braveheart,' and that had a huge impact on the political scene in Scotland. One of the results of that, in 2014 there's going to be a referendum in Scotland as to whether Scotland is going to be independent. A great deal of that was brought to the nation as a result of 'Braveheart.'

Any kind of problem you have in your life, you come to Bikram. Your life becomes the best in the world.

One must look for one thing only, to find many.